Method GetThreadGroupSize

src/task/task_control_block.cpp:106–129

auto TaskControlBlock::LeaveThreadGroup() -> void { ThreadGroupLink::unlink(); }

auto TaskControlBlock::GetThreadGroupSize() const -> size_t {
  if (aux->tgid == 0) {
    // 未加入任何线程组
    return 1;
  }

  size_t count = 1;

  // 向前遍历至链表头
  const ThreadGroupLink* curr = etl_previous;
  while (curr) {
    ++count;
    curr = curr->etl_previous;
  }

  // 向后遍历至链表尾
  curr = etl_next;
  while (curr) {
    ++count;
    curr = curr->etl_next;
  }

  return count;
}

TaskControlBlock::TaskControlBlock(const char* _name, int priority,
                                   ThreadEntry entry, void* arg)